they say they are obeying the law, but they are invariably stopped. >> police say that the evidence is there, that they're not just the eccentric tough guys. some chapters or branches have been shut down. the government is debating a national band. >> since 2004 we have arrested more than 500 biker gang members who have received over 380 years in prison. >> berlin is a hub for hell's angels. crucial for expansion. stephen schubert is about to publish his in depth study. >> berlin is crucial for globally operating by her clubs looking to expand. if you can control berlin, you control east germany. from there, you can conquer eastern europe. >> police shown no sign of loosening pressure. they have alleged that the hell's angels provide the muscle for protection rackets and run prostitution and drug rings. but in forcing a complete ban would be hard. steven evans, bbc news, berlin. >> a reminder our top story here, the united nations said the number of older people is growing faster than any other age group and more needs to be done to deal with the consequences in the developing world. t